define(function () {

  const glConstants = {
    /* ClearBufferMask */
    DEPTH_BUFFER_BIT               : 0x00000100,
    STENCIL_BUFFER_BIT             : 0x00000400,
    COLOR_BUFFER_BIT               : 0x00004000,

    /* BeginMode */
    POINTS                         : 0x0000,
    LINES                          : 0x0001,
    LINE_LOOP                      : 0x0002,
    LINE_STRIP                     : 0x0003,
    TRIANGLES                      : 0x0004,
    TRIANGLE_STRIP                 : 0x0005,
    TRIANGLE_FAN                   : 0x0006,

    /* AlphaFunction (not supported in ES20) */
    /*      NEVER */
    /*      LESS */
    /*      EQUAL */
    /*      LEQUAL */
    /*      GREATER */
    /*      NOTEQUAL */
    /*      GEQUAL */
    /*      ALWAYS */

    /* BlendingFactorDest */
    ZERO                           : 0,
    ONE                            : 1,
    SRC_COLOR                      : 0x0300,
    ONE_MINUS_SRC_COLOR            : 0x0301,
    SRC_ALPHA                      : 0x0302,
    ONE_MINUS_SRC_ALPHA            : 0x0303,
    DST_ALPHA                      : 0x0304,
    ONE_MINUS_DST_ALPHA            : 0x0305,

    /* BlendingFactorSrc */
    /*      ZERO */
    /*      ONE */
    DST_COLOR                      : 0x0306,
    ONE_MINUS_DST_COLOR            : 0x0307,
    SRC_ALPHA_SATURATE             : 0x0308,
    /*      SRC_ALPHA */
    /*      ONE_MINUS_SRC_ALPHA */
    /*      DST_ALPHA */
    /*      ONE_MINUS_DST_ALPHA */

    /* BlendEquationSeparate */
    FUNC_ADD                       : 0x8006,
    BLEND_EQUATION                 : 0x8009,
    BLEND_EQUATION_RGB             : 0x8009,   /* same as BLEND_EQUATION */
    BLEND_EQUATION_ALPHA           : 0x883D,

    /* BlendSubtract */
    FUNC_SUBTRACT                  : 0x800A,
    FUNC_REVERSE_SUBTRACT          : 0x800B,

    /* Separate Blend Functions */
    BLEND_DST_RGB                  : 0x80C8,
    BLEND_SRC_RGB                  : 0x80C9,
    BLEND_DST_ALPHA                : 0x80CA,
    BLEND_SRC_ALPHA                : 0x80CB,
    CONSTANT_COLOR                 : 0x8001,
    ONE_MINUS_CONSTANT_COLOR       : 0x8002,
    CONSTANT_ALPHA                 : 0x8003,
    ONE_MINUS_CONSTANT_ALPHA       : 0x8004,
    BLEND_COLOR                    : 0x8005,

    /* Buffer Objects */
    ARRAY_BUFFER                   : 0x8892,
    ELEMENT_ARRAY_BUFFER           : 0x8893,
    ARRAY_BUFFER_BINDING           : 0x8894,
    ELEMENT_ARRAY_BUFFER_BINDING   : 0x8895,

    STREAM_DRAW                    : 0x88E0,
    STATIC_DRAW                    : 0x88E4,
    DYNAMIC_DRAW                   : 0x88E8,

    BUFFER_SIZE                    : 0x8764,
    BUFFER_USAGE                   : 0x8765,

    CURRENT_VERTEX_ATTRIB          : 0x8626,

    /* CullFaceMode */
    FRONT                          : 0x0404,
    BACK                           : 0x0405,
    FRONT_AND_BACK                 : 0x0408,

    /* DepthFunction */
    /*      NEVER */
    /*      LESS */
    /*      EQUAL */
    /*      LEQUAL */
    /*      GREATER */
    /*      NOTEQUAL */
    /*      GEQUAL */
    /*      ALWAYS */

    /* EnableCap */
    /* TEXTURE_2D */
    CULL_FACE                      : 0x0B44,
    BLEND                          : 0x0BE2,
    DITHER                         : 0x0BD0,
    STENCIL_TEST                   : 0x0B90,
    DEPTH_TEST                     : 0x0B71,
    SCISSOR_TEST                   : 0x0C11,
    POLYGON_OFFSET_FILL            : 0x8037,
    SAMPLE_ALPHA_TO_COVERAGE       : 0x809E,
    SAMPLE_COVERAGE                : 0x80A0,

    /* ErrorCode */
    NO_ERROR                       : 0,
    INVALID_ENUM                   : 0x0500,
    INVALID_VALUE                  : 0x0501,
    INVALID_OPERATION              : 0x0502,
    OUT_OF_MEMORY                  : 0x0505,

    /* FrontFaceDirection */
    CW                             : 0x0900,
    CCW                            : 0x0901,

    /* GetPName */
    LINE_WIDTH                     : 0x0B21,
    ALIASED_POINT_SIZE_RANGE       : 0x846D,
    ALIASED_LINE_WIDTH_RANGE       : 0x846E,
    CULL_FACE_MODE                 : 0x0B45,
    FRONT_FACE                     : 0x0B46,
    DEPTH_RANGE                    : 0x0B70,
    DEPTH_WRITEMASK                : 0x0B72,
    DEPTH_CLEAR_VALUE              : 0x0B73,
    DEPTH_FUNC                     : 0x0B74,
    STENCIL_CLEAR_VALUE            : 0x0B91,
    STENCIL_FUNC                   : 0x0B92,
    STENCIL_FAIL                   : 0x0B94,
    STENCIL_PASS_DEPTH_FAIL        : 0x0B95,
    STENCIL_PASS_DEPTH_PASS        : 0x0B96,
    STENCIL_REF                    : 0x0B97,
    STENCIL_VALUE_MASK             : 0x0B93,
    STENCIL_WRITEMASK              : 0x0B98,
    STENCIL_BACK_FUNC              : 0x8800,
    STENCIL_BACK_FAIL              : 0x8801,
    STENCIL_BACK_PASS_DEPTH_FAIL   : 0x8802,
    STENCIL_BACK_PASS_DEPTH_PASS   : 0x8803,
    STENCIL_BACK_REF               : 0x8CA3,
    STENCIL_BACK_VALUE_MASK        : 0x8CA4,
    STENCIL_BACK_WRITEMASK         : 0x8CA5,
    VIEWPORT                       : 0x0BA2,
    SCISSOR_BOX                    : 0x0C10,
    /*      SCISSOR_TEST */
    COLOR_CLEAR_VALUE              : 0x0C22,
    COLOR_WRITEMASK                : 0x0C23,
    UNPACK_ALIGNMENT               : 0x0CF5,
    PACK_ALIGNMENT                 : 0x0D05,
    MAX_TEXTURE_SIZE               : 0x0D33,
    MAX_VIEWPORT_DIMS              : 0x0D3A,
    SUBPIXEL_BITS                  : 0x0D50,
    RED_BITS                       : 0x0D52,
    GREEN_BITS                     : 0x0D53,
    BLUE_BITS                      : 0x0D54,
    ALPHA_BITS                     : 0x0D55,
    DEPTH_BITS                     : 0x0D56,
    STENCIL_BITS                   : 0x0D57,
    POLYGON_OFFSET_UNITS           : 0x2A00,
    /*      POLYGON_OFFSET_FILL */
    POLYGON_OFFSET_FACTOR          : 0x8038,
    TEXTURE_BINDING_2D             : 0x8069,
    SAMPLE_BUFFERS                 : 0x80A8,
    SAMPLES                        : 0x80A9,
    SAMPLE_COVERAGE_VALUE          : 0x80AA,
    SAMPLE_COVERAGE_INVERT         : 0x80AB,

    /* GetTextureParameter */
    /*      TEXTURE_MAG_FILTER */
    /*      TEXTURE_MIN_FILTER */
    /*      TEXTURE_WRAP_S */
    /*      TEXTURE_WRAP_T */

    COMPRESSED_TEXTURE_FORMATS     : 0x86A3,

    /* HintMode */
    DONT_CARE                      : 0x1100,
    FASTEST                        : 0x1101,
    NICEST                         : 0x1102,

    /* HintTarget */
    GENERATE_MIPMAP_HINT            : 0x8192,

    /* DataType */
    BYTE                           : 0x1400,
    UNSIGNED_BYTE                  : 0x1401,
    SHORT                          : 0x1402,
    UNSIGNED_SHORT                 : 0x1403,
    INT                            : 0x1404,
    UNSIGNED_INT                   : 0x1405,
    FLOAT                          : 0x1406,

    /* PixelFormat */
    DEPTH_COMPONENT                : 0x1902,
    ALPHA                          : 0x1906,
    RGB                            : 0x1907,
    RGBA                           : 0x1908,
    LUMINANCE                      : 0x1909,
    LUMINANCE_ALPHA                : 0x190A,

    /* PixelType */
    /*      UNSIGNED_BYTE */
    UNSIGNED_SHORT_4_4_4_4         : 0x8033,
    UNSIGNED_SHORT_5_5_5_1         : 0x8034,
    UNSIGNED_SHORT_5_6_5           : 0x8363,

    /* Shaders */
    FRAGMENT_SHADER                  : 0x8B30,
    VERTEX_SHADER                    : 0x8B31,
    MAX_VERTEX_ATTRIBS               : 0x8869,
    MAX_VERTEX_UNIFORM_VECTORS       : 0x8DFB,
    MAX_VARYING_VECTORS              : 0x8DFC,
    MAX_COMBINED_TEXTURE_IMAGE_UNITS : 0x8B4D,
    MAX_VERTEX_TEXTURE_IMAGE_UNITS   : 0x8B4C,
    MAX_TEXTURE_IMAGE_UNITS          : 0x8872,
    MAX_FRAGMENT_UNIFORM_VECTORS     : 0x8DFD,
    SHADER_TYPE                      : 0x8B4F,
    DELETE_STATUS                    : 0x8B80,
    LINK_STATUS                      : 0x8B82,
    VALIDATE_STATUS                  : 0x8B83,
    ATTACHED_SHADERS                 : 0x8B85,
    ACTIVE_UNIFORMS                  : 0x8B86,
    ACTIVE_ATTRIBUTES                : 0x8B89,
    SHADING_LANGUAGE_VERSION         : 0x8B8C,
    CURRENT_PROGRAM                  : 0x8B8D,

    /* StencilFunction */
    NEVER                          : 0x0200,
    LESS                           : 0x0201,
    EQUAL                          : 0x0202,
    LEQUAL                         : 0x0203,
    GREATER                        : 0x0204,
    NOTEQUAL                       : 0x0205,
    GEQUAL                         : 0x0206,
    ALWAYS                         : 0x0207,

    /* StencilOp */
    /*      ZERO */
    KEEP                           : 0x1E00,
    REPLACE                        : 0x1E01,
    INCR                           : 0x1E02,
    DECR                           : 0x1E03,
    INVERT                         : 0x150A,
    INCR_WRAP                      : 0x8507,
    DECR_WRAP                      : 0x8508,

    /* StringName */
    VENDOR                         : 0x1F00,
    RENDERER                       : 0x1F01,
    VERSION                        : 0x1F02,

    /* TextureMagFilter */
    NEAREST                        : 0x2600,
    LINEAR                         : 0x2601,

    /* TextureMinFilter */
    /*      NEAREST */
    /*      LINEAR */
    NEAREST_MIPMAP_NEAREST         : 0x2700,
    LINEAR_MIPMAP_NEAREST          : 0x2701,
    NEAREST_MIPMAP_LINEAR          : 0x2702,
    LINEAR_MIPMAP_LINEAR           : 0x2703,

    /* TextureParameterName */
    TEXTURE_MAG_FILTER             : 0x2800,
    TEXTURE_MIN_FILTER             : 0x2801,
    TEXTURE_WRAP_S                 : 0x2802,
    TEXTURE_WRAP_T                 : 0x2803,

    /* TextureTarget */
    TEXTURE_2D                     : 0x0DE1,
    TEXTURE                        : 0x1702,

    TEXTURE_CUBE_MAP               : 0x8513,
    TEXTURE_BINDING_CUBE_MAP       : 0x8514,
    TEXTURE_CUBE_MAP_POSITIVE_X    : 0x8515,
    TEXTURE_CUBE_MAP_NEGATIVE_X    : 0x8516,
    TEXTURE_CUBE_MAP_POSITIVE_Y    : 0x8517,
    TEXTURE_CUBE_MAP_NEGATIVE_Y    : 0x8518,
    TEXTURE_CUBE_MAP_POSITIVE_Z    : 0x8519,
    TEXTURE_CUBE_MAP_NEGATIVE_Z    : 0x851A,
    MAX_CUBE_MAP_TEXTURE_SIZE      : 0x851C,

    /* TextureUnit */
    TEXTURE0                       : 0x84C0,
    TEXTURE1                       : 0x84C1,
    TEXTURE2                       : 0x84C2,
    TEXTURE3                       : 0x84C3,
    TEXTURE4                       : 0x84C4,
    TEXTURE5                       : 0x84C5,
    TEXTURE6                       : 0x84C6,
    TEXTURE7                       : 0x84C7,
    TEXTURE8                       : 0x84C8,
    TEXTURE9                       : 0x84C9,
    TEXTURE10                      : 0x84CA,
    TEXTURE11                      : 0x84CB,
    TEXTURE12                      : 0x84CC,
    TEXTURE13                      : 0x84CD,
    TEXTURE14                      : 0x84CE,
    TEXTURE15                      : 0x84CF,
    TEXTURE16                      : 0x84D0,
    TEXTURE17                      : 0x84D1,
    TEXTURE18                      : 0x84D2,
    TEXTURE19                      : 0x84D3,
    TEXTURE20                      : 0x84D4,
    TEXTURE21                      : 0x84D5,
    TEXTURE22                      : 0x84D6,
    TEXTURE23                      : 0x84D7,
    TEXTURE24                      : 0x84D8,
    TEXTURE25                      : 0x84D9,
    TEXTURE26                      : 0x84DA,
    TEXTURE27                      : 0x84DB,
    TEXTURE28                      : 0x84DC,
    TEXTURE29                      : 0x84DD,
    TEXTURE30                      : 0x84DE,
    TEXTURE31                      : 0x84DF,
    ACTIVE_TEXTURE                 : 0x84E0,

    /* TextureWrapMode */
    REPEAT                         : 0x2901,
    CLAMP_TO_EDGE                  : 0x812F,
    MIRRORED_REPEAT                : 0x8370,

    /* Uniform Types */
    FLOAT_VEC2                     : 0x8B50,
    FLOAT_VEC3                     : 0x8B51,
    FLOAT_VEC4                     : 0x8B52,
    INT_VEC2                       : 0x8B53,
    INT_VEC3                       : 0x8B54,
    INT_VEC4                       : 0x8B55,
    BOOL                           : 0x8B56,
    BOOL_VEC2                      : 0x8B57,
    BOOL_VEC3                      : 0x8B58,
    BOOL_VEC4                      : 0x8B59,
    FLOAT_MAT2                     : 0x8B5A,
    FLOAT_MAT3                     : 0x8B5B,
    FLOAT_MAT4                     : 0x8B5C,
    SAMPLER_2D                     : 0x8B5E,
    SAMPLER_CUBE                   : 0x8B60,

    /* Vertex Arrays */
    VERTEX_ATTRIB_ARRAY_ENABLED        : 0x8622,
    VERTEX_ATTRIB_ARRAY_SIZE           : 0x8623,
    VERTEX_ATTRIB_ARRAY_STRIDE         : 0x8624,
    VERTEX_ATTRIB_ARRAY_TYPE           : 0x8625,
    VERTEX_ATTRIB_ARRAY_NORMALIZED     : 0x886A,
    VERTEX_ATTRIB_ARRAY_POINTER        : 0x8645,
    VERTEX_ATTRIB_ARRAY_BUFFER_BINDING : 0x889F,

    /* Shader Source */
    COMPILE_STATUS                 : 0x8B81,

    /* Shader Precision-Specified Types */
    LOW_FLOAT                      : 0x8DF0,
    MEDIUM_FLOAT                   : 0x8DF1,
    HIGH_FLOAT                     : 0x8DF2,
    LOW_INT                        : 0x8DF3,
    MEDIUM_INT                     : 0x8DF4,
    HIGH_INT                       : 0x8DF5,

    /* Framebuffer Object. */
    FRAMEBUFFER                    : 0x8D40,
    RENDERBUFFER                   : 0x8D41,

    RGBA4                          : 0x8056,
    RGB5_A1                        : 0x8057,
    RGB565                         : 0x8D62,
    DEPTH_COMPONENT16              : 0x81A5,
    STENCIL_INDEX                  : 0x1901,
    STENCIL_INDEX8                 : 0x8D48,
    DEPTH_STENCIL                  : 0x84F9,

    RENDERBUFFER_WIDTH             : 0x8D42,
    RENDERBUFFER_HEIGHT            : 0x8D43,
    RENDERBUFFER_INTERNAL_FORMAT   : 0x8D44,
    RENDERBUFFER_RED_SIZE          : 0x8D50,
    RENDERBUFFER_GREEN_SIZE        : 0x8D51,
    RENDERBUFFER_BLUE_SIZE         : 0x8D52,
    RENDERBUFFER_ALPHA_SIZE        : 0x8D53,
    RENDERBUFFER_DEPTH_SIZE        : 0x8D54,
    RENDERBUFFER_STENCIL_SIZE      : 0x8D55,

    FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE           : 0x8CD0,
    FRAMEBUFFER_ATTACHMENT_OBJECT_NAME           : 0x8CD1,
    FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL         : 0x8CD2,
    FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE : 0x8CD3,

    COLOR_ATTACHMENT0              : 0x8CE0,
    DEPTH_ATTACHMENT               : 0x8D00,
    STENCIL_ATTACHMENT             : 0x8D20,
    DEPTH_STENCIL_ATTACHMENT       : 0x821A,

    NONE                           : 0,

    FRAMEBUFFER_COMPLETE                      : 0x8CD5,
    FRAMEBUFFER_INCOMPLETE_ATTACHMENT         : 0x8CD6,
    FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT : 0x8CD7,
    FRAMEBUFFER_INCOMPLETE_DIMENSIONS         : 0x8CD9,
    FRAMEBUFFER_UNSUPPORTED                   : 0x8CDD,

    FRAMEBUFFER_BINDING            : 0x8CA6,
    RENDERBUFFER_BINDING           : 0x8CA7,
    MAX_RENDERBUFFER_SIZE          : 0x84E8,

    INVALID_FRAMEBUFFER_OPERATION  : 0x0506,

    /* WebGL-specific enums */
    UNPACK_FLIP_Y_WEBGL            : 0x9240,
    UNPACK_PREMULTIPLY_ALPHA_WEBGL : 0x9241,
    CONTEXT_LOST_WEBGL             : 0x9242,
    UNPACK_COLORSPACE_CONVERSION_WEBGL : 0x9243,
    BROWSER_DEFAULT_WEBGL          : 0x9244,

    READ_BUFFER                                   : 0x0C02,
    UNPACK_ROW_LENGTH                             : 0x0CF2,
    UNPACK_SKIP_ROWS                              : 0x0CF3,
    UNPACK_SKIP_PIXELS                            : 0x0CF4,
    PACK_ROW_LENGTH                               : 0x0D02,
    PACK_SKIP_ROWS                                : 0x0D03,
    PACK_SKIP_PIXELS                              : 0x0D04,
    COLOR                                         : 0x1800,
    DEPTH                                         : 0x1801,
    STENCIL                                       : 0x1802,
    RED                                           : 0x1903,
    RGB8                                          : 0x8051,
    RGBA8                                         : 0x8058,
    RGB10_A2                                      : 0x8059,
    TEXTURE_BINDING_3D                            : 0x806A,
    UNPACK_SKIP_IMAGES                            : 0x806D,
    UNPACK_IMAGE_HEIGHT                           : 0x806E,
    TEXTURE_3D                                    : 0x806F,
    TEXTURE_WRAP_R                                : 0x8072,
    MAX_3D_TEXTURE_SIZE                           : 0x8073,
    UNSIGNED_INT_2_10_10_10_REV                   : 0x8368,
    MAX_ELEMENTS_VERTICES                         : 0x80E8,
    MAX_ELEMENTS_INDICES                          : 0x80E9,
    TEXTURE_MIN_LOD                               : 0x813A,
    TEXTURE_MAX_LOD                               : 0x813B,
    TEXTURE_BASE_LEVEL                            : 0x813C,
    TEXTURE_MAX_LEVEL                             : 0x813D,
    MIN                                           : 0x8007,
    MAX                                           : 0x8008,
    DEPTH_COMPONENT24                             : 0x81A6,
    MAX_TEXTURE_LOD_BIAS                          : 0x84FD,
    TEXTURE_COMPARE_MODE                          : 0x884C,
    TEXTURE_COMPARE_FUNC                          : 0x884D,
    CURRENT_QUERY                                 : 0x8865,
    QUERY_RESULT                                  : 0x8866,
    QUERY_RESULT_AVAILABLE                        : 0x8867,
    STREAM_READ                                   : 0x88E1,
    STREAM_COPY                                   : 0x88E2,
    STATIC_READ                                   : 0x88E5,
    STATIC_COPY                                   : 0x88E6,
    DYNAMIC_READ                                  : 0x88E9,
    DYNAMIC_COPY                                  : 0x88EA,
    MAX_DRAW_BUFFERS                              : 0x8824,
    DRAW_BUFFER0                                  : 0x8825,
    DRAW_BUFFER1                                  : 0x8826,
    DRAW_BUFFER2                                  : 0x8827,
    DRAW_BUFFER3                                  : 0x8828,
    DRAW_BUFFER4                                  : 0x8829,
    DRAW_BUFFER5                                  : 0x882A,
    DRAW_BUFFER6                                  : 0x882B,
    DRAW_BUFFER7                                  : 0x882C,
    DRAW_BUFFER8                                  : 0x882D,
    DRAW_BUFFER9                                  : 0x882E,
    DRAW_BUFFER10                                 : 0x882F,
    DRAW_BUFFER11                                 : 0x8830,
    DRAW_BUFFER12                                 : 0x8831,
    DRAW_BUFFER13                                 : 0x8832,
    DRAW_BUFFER14                                 : 0x8833,
    DRAW_BUFFER15                                 : 0x8834,
    MAX_FRAGMENT_UNIFORM_COMPONENTS               : 0x8B49,
    MAX_VERTEX_UNIFORM_COMPONENTS                 : 0x8B4A,
    SAMPLER_3D                                    : 0x8B5F,
    SAMPLER_2D_SHADOW                             : 0x8B62,
    FRAGMENT_SHADER_DERIVATIVE_HINT               : 0x8B8B,
    PIXEL_PACK_BUFFER                             : 0x88EB,
    PIXEL_UNPACK_BUFFER                           : 0x88EC,
    PIXEL_PACK_BUFFER_BINDING                     : 0x88ED,
    PIXEL_UNPACK_BUFFER_BINDING                   : 0x88EF,
    FLOAT_MAT2x3                                  : 0x8B65,
    FLOAT_MAT2x4                                  : 0x8B66,
    FLOAT_MAT3x2                                  : 0x8B67,
    FLOAT_MAT3x4                                  : 0x8B68,
    FLOAT_MAT4x2                                  : 0x8B69,
    FLOAT_MAT4x3                                  : 0x8B6A,
    SRGB                                          : 0x8C40,
    SRGB8                                         : 0x8C41,
    SRGB8_ALPHA8                                  : 0x8C43,
    COMPARE_REF_TO_TEXTURE                        : 0x884E,
    RGBA32F                                       : 0x8814,
    RGB32F                                        : 0x8815,
    RGBA16F                                       : 0x881A,
    RGB16F                                        : 0x881B,
    VERTEX_ATTRIB_ARRAY_INTEGER                   : 0x88FD,
    MAX_ARRAY_TEXTURE_LAYERS                      : 0x88FF,
    MIN_PROGRAM_TEXEL_OFFSET                      : 0x8904,
    MAX_PROGRAM_TEXEL_OFFSET                      : 0x8905,
    MAX_VARYING_COMPONENTS                        : 0x8B4B,
    TEXTURE_2D_ARRAY                              : 0x8C1A,
    TEXTURE_BINDING_2D_ARRAY                      : 0x8C1D,
    R11F_G11F_B10F                                : 0x8C3A,
    UNSIGNED_INT_10F_11F_11F_REV                  : 0x8C3B,
    RGB9_E5                                       : 0x8C3D,
    UNSIGNED_INT_5_9_9_9_REV                      : 0x8C3E,
    TRANSFORM_FEEDBACK_BUFFER_MODE                : 0x8C7F,
    MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS    : 0x8C80,
    TRANSFORM_FEEDBACK_VARYINGS                   : 0x8C83,
    TRANSFORM_FEEDBACK_BUFFER_START               : 0x8C84,
    TRANSFORM_FEEDBACK_BUFFER_SIZE                : 0x8C85,
    TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN         : 0x8C88,
    RASTERIZER_DISCARD                            : 0x8C89,
    MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS : 0x8C8A,
    MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS       : 0x8C8B,
    INTERLEAVED_ATTRIBS                           : 0x8C8C,
    SEPARATE_ATTRIBS                              : 0x8C8D,
    TRANSFORM_FEEDBACK_BUFFER                     : 0x8C8E,
    TRANSFORM_FEEDBACK_BUFFER_BINDING             : 0x8C8F,
    RGBA32UI                                      : 0x8D70,
    RGB32UI                                       : 0x8D71,
    RGBA16UI                                      : 0x8D76,
    RGB16UI                                       : 0x8D77,
    RGBA8UI                                       : 0x8D7C,
    RGB8UI                                        : 0x8D7D,
    RGBA32I                                       : 0x8D82,
    RGB32I                                        : 0x8D83,
    RGBA16I                                       : 0x8D88,
    RGB16I                                        : 0x8D89,
    RGBA8I                                        : 0x8D8E,
    RGB8I                                         : 0x8D8F,
    RED_INTEGER                                   : 0x8D94,
    RGB_INTEGER                                   : 0x8D98,
    RGBA_INTEGER                                  : 0x8D99,
    SAMPLER_2D_ARRAY                              : 0x8DC1,
    SAMPLER_2D_ARRAY_SHADOW                       : 0x8DC4,
    SAMPLER_CUBE_SHADOW                           : 0x8DC5,
    UNSIGNED_INT_VEC2                             : 0x8DC6,
    UNSIGNED_INT_VEC3                             : 0x8DC7,
    UNSIGNED_INT_VEC4                             : 0x8DC8,
    INT_SAMPLER_2D                                : 0x8DCA,
    INT_SAMPLER_3D                                : 0x8DCB,
    INT_SAMPLER_CUBE                              : 0x8DCC,
    INT_SAMPLER_2D_ARRAY                          : 0x8DCF,
    UNSIGNED_INT_SAMPLER_2D                       : 0x8DD2,
    UNSIGNED_INT_SAMPLER_3D                       : 0x8DD3,
    UNSIGNED_INT_SAMPLER_CUBE                     : 0x8DD4,
    UNSIGNED_INT_SAMPLER_2D_ARRAY                 : 0x8DD7,
    DEPTH_COMPONENT32F                            : 0x8CAC,
    DEPTH32F_STENCIL8                             : 0x8CAD,
    FLOAT_32_UNSIGNED_INT_24_8_REV                : 0x8DAD,
    FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING         : 0x8210,
    FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE         : 0x8211,
    FRAMEBUFFER_ATTACHMENT_RED_SIZE               : 0x8212,
    FRAMEBUFFER_ATTACHMENT_GREEN_SIZE             : 0x8213,
    FRAMEBUFFER_ATTACHMENT_BLUE_SIZE              : 0x8214,
    FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE             : 0x8215,
    FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE             : 0x8216,
    FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE           : 0x8217,
    FRAMEBUFFER_DEFAULT                           : 0x8218,
    DEPTH_STENCIL_ATTACHMENT                      : 0x821A,
    DEPTH_STENCIL                                 : 0x84F9,
    UNSIGNED_INT_24_8                             : 0x84FA,
    DEPTH24_STENCIL8                              : 0x88F0,
    UNSIGNED_NORMALIZED                           : 0x8C17,
    DRAW_FRAMEBUFFER_BINDING                      : 0x8CA6, /* Same as FRAMEBUFFER_BINDING */
    READ_FRAMEBUFFER                              : 0x8CA8,
    DRAW_FRAMEBUFFER                              : 0x8CA9,
    READ_FRAMEBUFFER_BINDING                      : 0x8CAA,
    RENDERBUFFER_SAMPLES                          : 0x8CAB,
    FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER          : 0x8CD4,
    MAX_COLOR_ATTACHMENTS                         : 0x8CDF,
    COLOR_ATTACHMENT1                             : 0x8CE1,
    COLOR_ATTACHMENT2                             : 0x8CE2,
    COLOR_ATTACHMENT3                             : 0x8CE3,
    COLOR_ATTACHMENT4                             : 0x8CE4,
    COLOR_ATTACHMENT5                             : 0x8CE5,
    COLOR_ATTACHMENT6                             : 0x8CE6,
    COLOR_ATTACHMENT7                             : 0x8CE7,
    COLOR_ATTACHMENT8                             : 0x8CE8,
    COLOR_ATTACHMENT9                             : 0x8CE9,
    COLOR_ATTACHMENT10                            : 0x8CEA,
    COLOR_ATTACHMENT11                            : 0x8CEB,
    COLOR_ATTACHMENT12                            : 0x8CEC,
    COLOR_ATTACHMENT13                            : 0x8CED,
    COLOR_ATTACHMENT14                            : 0x8CEE,
    COLOR_ATTACHMENT15                            : 0x8CEF,
    FRAMEBUFFER_INCOMPLETE_MULTISAMPLE            : 0x8D56,
    MAX_SAMPLES                                   : 0x8D57,
    HALF_FLOAT                                    : 0x140B,
    RG                                            : 0x8227,
    RG_INTEGER                                    : 0x8228,
    R8                                            : 0x8229,
    RG8                                           : 0x822B,
    R16F                                          : 0x822D,
    R32F                                          : 0x822E,
    RG16F                                         : 0x822F,
    RG32F                                         : 0x8230,
    R8I                                           : 0x8231,
    R8UI                                          : 0x8232,
    R16I                                          : 0x8233,
    R16UI                                         : 0x8234,
    R32I                                          : 0x8235,
    R32UI                                         : 0x8236,
    RG8I                                          : 0x8237,
    RG8UI                                         : 0x8238,
    RG16I                                         : 0x8239,
    RG16UI                                        : 0x823A,
    RG32I                                         : 0x823B,
    RG32UI                                        : 0x823C,
    VERTEX_ARRAY_BINDING                          : 0x85B5,
    R8_SNORM                                      : 0x8F94,
    RG8_SNORM                                     : 0x8F95,
    RGB8_SNORM                                    : 0x8F96,
    RGBA8_SNORM                                   : 0x8F97,
    SIGNED_NORMALIZED                             : 0x8F9C,
    COPY_READ_BUFFER                              : 0x8F36,
    COPY_WRITE_BUFFER                             : 0x8F37,
    COPY_READ_BUFFER_BINDING                      : 0x8F36, /* Same as COPY_READ_BUFFER */
    COPY_WRITE_BUFFER_BINDING                     : 0x8F37, /* Same as COPY_WRITE_BUFFER */
    UNIFORM_BUFFER                                : 0x8A11,
    UNIFORM_BUFFER_BINDING                        : 0x8A28,
    UNIFORM_BUFFER_START                          : 0x8A29,
    UNIFORM_BUFFER_SIZE                           : 0x8A2A,
    MAX_VERTEX_UNIFORM_BLOCKS                     : 0x8A2B,
    MAX_FRAGMENT_UNIFORM_BLOCKS                   : 0x8A2D,
    MAX_COMBINED_UNIFORM_BLOCKS                   : 0x8A2E,
    MAX_UNIFORM_BUFFER_BINDINGS                   : 0x8A2F,
    MAX_UNIFORM_BLOCK_SIZE                        : 0x8A30,
    MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS        : 0x8A31,
    MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS      : 0x8A33,
    UNIFORM_BUFFER_OFFSET_ALIGNMENT               : 0x8A34,
    ACTIVE_UNIFORM_BLOCKS                         : 0x8A36,
    UNIFORM_TYPE                                  : 0x8A37,
    UNIFORM_SIZE                                  : 0x8A38,
    UNIFORM_BLOCK_INDEX                           : 0x8A3A,
    UNIFORM_OFFSET                                : 0x8A3B,
    UNIFORM_ARRAY_STRIDE                          : 0x8A3C,
    UNIFORM_MATRIX_STRIDE                         : 0x8A3D,
    UNIFORM_IS_ROW_MAJOR                          : 0x8A3E,
    UNIFORM_BLOCK_BINDING                         : 0x8A3F,
    UNIFORM_BLOCK_DATA_SIZE                       : 0x8A40,
    UNIFORM_BLOCK_ACTIVE_UNIFORMS                 : 0x8A42,
    UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES          : 0x8A43,
    UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER     : 0x8A44,
    UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER   : 0x8A46,
    INVALID_INDEX                                 : 0xFFFFFFFF,
    MAX_VERTEX_OUTPUT_COMPONENTS                  : 0x9122,
    MAX_FRAGMENT_INPUT_COMPONENTS                 : 0x9125,
    MAX_SERVER_WAIT_TIMEOUT                       : 0x9111,
    OBJECT_TYPE                                   : 0x9112,
    SYNC_CONDITION                                : 0x9113,
    SYNC_STATUS                                   : 0x9114,
    SYNC_FLAGS                                    : 0x9115,
    SYNC_FENCE                                    : 0x9116,
    SYNC_GPU_COMMANDS_COMPLETE                    : 0x9117,
    UNSIGNALED                                    : 0x9118,
    SIGNALED                                      : 0x9119,
    ALREADY_SIGNALED                              : 0x911A,
    TIMEOUT_EXPIRED                               : 0x911B,
    CONDITION_SATISFIED                           : 0x911C,
    WAIT_FAILED                                   : 0x911D,
    SYNC_FLUSH_COMMANDS_BIT                       : 0x00000001,
    VERTEX_ATTRIB_ARRAY_DIVISOR                   : 0x88FE,
    ANY_SAMPLES_PASSED                            : 0x8C2F,
    ANY_SAMPLES_PASSED_CONSERVATIVE               : 0x8D6A,
    SAMPLER_BINDING                               : 0x8919,
    RGB10_A2UI                                    : 0x906F,
    INT_2_10_10_10_REV                            : 0x8D9F,
    TRANSFORM_FEEDBACK                            : 0x8E22,
    TRANSFORM_FEEDBACK_PAUSED                     : 0x8E23,
    TRANSFORM_FEEDBACK_ACTIVE                     : 0x8E24,
    TRANSFORM_FEEDBACK_BINDING                    : 0x8E25,
    TEXTURE_IMMUTABLE_FORMAT                      : 0x912F,
    MAX_ELEMENT_INDEX                             : 0x8D6B,
    TEXTURE_IMMUTABLE_LEVELS                      : 0x82DF,

    TIMEOUT_IGNORED                              : -1,

    /* WebGL-specific enums */
    MAX_CLIENT_WAIT_TIMEOUT_WEBGL                 : 0x9247,

    // WEBGL_compressed_texture_s3tc
    COMPRESSED_RGB_S3TC_DXT1_EXT                  : 0x83F0,
    COMPRESSED_RGBA_S3TC_DXT1_EXT                 : 0x83F1,
    COMPRESSED_RGBA_S3TC_DXT3_EXT                 : 0x83F2,
    COMPRESSED_RGBA_S3TC_DXT5_EXT                 : 0x83F3,

    // ES3.0 compressed texture formats
    COMPRESSED_R11_EAC                            : 0x9270,
    COMPRESSED_SIGNED_R11_EAC                     : 0x9271,
    COMPRESSED_RG11_EAC                           : 0x9272,
    COMPRESSED_SIGNED_RG11_EAC                    : 0x9273,
    COMPRESSED_RGB8_ETC2                          : 0x9274,
    COMPRESSED_SRGB8_ETC2                         : 0x9275,
    COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2      : 0x9276,
    COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2     : 0x9277,
    COMPRESSED_RGBA8_ETC2_EAC                     : 0x9278,
    COMPRESSED_SRGB8_ALPHA8_ETC2_EAC              : 0x9279,

    // WEBGL_compressed_texture_atc
    COMPRESSED_RGB_ATC_WEBGL                      : 0x8C92,
    COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL      : 0x8C93,
    COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL  : 0x87EE,

    // WEBGL_compressed_texture_pvrtc
    COMPRESSED_RGB_PVRTC_4BPPV1_IMG               : 0x8C00,
    COMPRESSED_RGB_PVRTC_2BPPV1_IMG               : 0x8C01,
    COMPRESSED_RGBA_PVRTC_4BPPV1_IMG              : 0x8C02,
    COMPRESSED_RGBA_PVRTC_2BPPV1_IMG              : 0x8C03,

  };

  return glConstants;

});

